One of the UK's colonies is administered as a part of Hanover rather than as a part of England.
Charles VI is more pragmatic and bets on strength rather than flimsy guarantees, the Ostend Company stays in place and the Austrian military is not allowed to decline as it did OTL. The war of Austrian Succession is a stomp, and Austria takes one or two of France's Islands as reparations.
See the above, but still have the Brabant Revolution (or something similar) take place.
Happened OTL as mentioned above.
During the Seven Years War a Portuguese expedition occupies the Florida Keys (they count right?) and Spain decides that it's an alright trade for settling the Brazil-Río de la Plata boundary dispute in their favour.
Denmark sells to someone else.
The 1897 War goes worse for Greece, and it's sufficiently rattled to believe a second Tourkokratia is imminent and they decide to invest in Dausuva-esque shenanigans, facilitated by Denmark selling to someone else.
Denmark sells to someone else.
Denmark sells to someone else.
You'd have to arrest their 18th century decline, which was already well underway in the previous century.